Struct NSCell

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#[repr(C)]
pub struct NSCell { /* private fields */ }

Available on crate feature NSCell only.

Expand description

pub unsafe fn initWithCoder( this: Allocated<Self>, coder: &NSCoder, ) -> Retained<Self>

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pub unsafe fn prefersTrackingUntilMouseUp(mtm: MainThreadMarker) -> bool

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pub unsafe fn controlView(&self) -> Option<Retained<NSView>>

Available on crate features NSResponder and NSView only.

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pub unsafe fn setControlView(&self, control_view: Option<&NSView>)

Available on crate features NSResponder and NSView only.

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pub unsafe fn setEnabled(&self, enabled: bool)

Setter for isEnabled.

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pub unsafe fn sendActionOn(&self, mask: NSEventMask) -> NSInteger

Available on crate feature NSEvent only.

Available on crate feature NSText only.

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pub unsafe fn setAlignment(&self, alignment: NSTextAlignment)

Available on crate feature NSText only.

Setter for alignment.

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pub unsafe fn wraps(&self) -> bool

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pub unsafe fn setWraps(&self, wraps: bool)

Setter for wraps.

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pub unsafe fn font(&self) -> Option<Retained<NSFont>>

Available on crate feature NSFont only.

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pub unsafe fn setFont(&self, font: Option<&NSFont>)

Available on crate feature NSFont only.

Setter for font.

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pub unsafe fn setStringValue(&self, string_value: &NSString)

Setter for stringValue.

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pub unsafe fn setImage(&self, image: Option<&NSImage>)

Available on crate feature NSImage only.

Available on crate features NSColor and NSResponder and NSView only.

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pub unsafe fn calcDrawInfo(&self, rect: NSRect)

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pub unsafe fn setUpFieldEditorAttributes( &self, text_obj: &NSText, ) -> Retained<NSText>

Available on crate features NSResponder and NSText and NSView only.

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pub unsafe fn drawInteriorWithFrame_inView( &self, cell_frame: NSRect, control_view: &NSView, )

Available on crate features NSResponder and NSView only.

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pub unsafe fn drawWithFrame_inView( &self, cell_frame: NSRect, control_view: &NSView, )

Available on crate features NSResponder and NSView only.

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pub unsafe fn highlight_withFrame_inView( &self, flag: bool, cell_frame: NSRect, control_view: &NSView, )

Available on crate features NSResponder and NSView only.

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pub unsafe fn mouseDownFlags(&self) -> NSInteger

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Available on crate features NSEvent and NSMenu and NSResponder and NSView only.

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pub unsafe fn defaultMenu(mtm: MainThreadMarker) -> Option<Retained<NSMenu>>

Available on crate feature NSMenu only.

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pub unsafe fn sendsActionOnEndEditing(&self) -> bool

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pub unsafe fn setSendsActionOnEndEditing( &self, sends_action_on_end_editing: bool, )

Setter for sendsActionOnEndEditing.

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pub unsafe fn baseWritingDirection(&self) -> NSWritingDirection

Available on crate feature NSText only.

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pub unsafe fn setBaseWritingDirection( &self, base_writing_direction: NSWritingDirection, )

Available on crate feature NSText only.

Setter for baseWritingDirection.

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pub unsafe fn lineBreakMode(&self) -> NSLineBreakMode

Available on crate feature NSParagraphStyle only.

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pub unsafe fn setLineBreakMode(&self, line_break_mode: NSLineBreakMode)

Available on crate feature NSParagraphStyle only.

pub unsafe fn setUserInterfaceLayoutDirection( &self, user_interface_layout_direction: NSUserInterfaceLayoutDirection, )

Available on crate feature NSUserInterfaceLayout only.

Setter for userInterfaceLayoutDirection.

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pub unsafe fn fieldEditorForView( &self, control_view: &NSView, ) -> Option<Retained<NSTextView>>

Available on crate features NSResponder and NSText and NSTextView and NSView only.

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pub unsafe fn usesSingleLineMode(&self) -> bool

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pub unsafe fn setUsesSingleLineMode(&self, uses_single_line_mode: bool)

Setter for usesSingleLineMode.

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pub unsafe fn draggingImageComponentsWithFrame_inView( &self, frame: NSRect, view: &NSView, ) -> Retained<NSArray<NSDraggingImageComponent>>

Available on crate features NSDraggingItem and NSResponder and NSView only.

pub unsafe fn defaultFocusRingType(mtm: MainThreadMarker) -> NSFocusRingType

Available on crate feature NSGraphics only.

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pub unsafe fn drawFocusRingMaskWithFrame_inView( &self, cell_frame: NSRect, control_view: &NSView, )

Available on crate features NSResponder and NSView only.

NSCellMixedState.

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impl NSCell

NSCellExpansion.

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pub unsafe fn expansionFrameWithFrame_inView( &self, cell_frame: NSRect, view: &NSView, ) -> NSRect

Available on crate features NSResponder and NSView only.

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pub unsafe fn drawWithExpansionFrame_inView( &self, cell_frame: NSRect, view: &NSView, )

Available on crate features NSResponder and NSView only.

👎Deprecated: The controlTint property is not respected on 10.14 and later. For custom cells, use +[NSColor controlAccentColor] to respect the user’s preferred accent color when drawing.

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pub unsafe fn setControlTint(&self, control_tint: NSControlTint)

👎Deprecated: The controlTint property is not respected on 10.14 and later. For custom cells, use +[NSColor controlAccentColor] to respect the user’s preferred accent color when drawing.

pub unsafe fn get_ivar<T>(&self, name: &str) -> &T
where T: Encode,

👎Deprecated: this is difficult to use correctly, use Ivar::load instead.

Available on crate feature NSAccessibilityConstants only.

Use Ivar::load instead.

§Safety

The object must have an instance variable with the given name, and it must be of type T.

See Ivar::load_ptr for details surrounding this.

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pub fn downcast_ref<T>(&self) -> Option<&T>
where T: DowncastTarget,

Available on crate feature NSAccessibilityConstants only.

Attempt to downcast the object to a class of type T.

This is the reference-variant. Use Retained::downcast if you want to convert a retained object to another type.

§Mutable classes

Some classes have immutable and mutable variants, such as NSString and NSMutableString.

When some Objective-C API signature says it gives you an immutable class, it generally expects you to not mutate that, even though it may technically be mutable “under the hood”.

So using this method to convert a NSString to a NSMutableString, while not unsound, is generally frowned upon unless you created the string yourself, or the API explicitly documents the string to be mutable.

See Apple’s documentation on mutability and on isKindOfClass: for more details.

§Generic classes

Objective-C generics are called “lightweight generics”, and that’s because they aren’t exposed in the runtime. This makes it impossible to safely downcast to generic collections, so this is disallowed by this method.

You can, however, safely downcast to generic collections where all the type-parameters are AnyObject.

§Panics

This works internally by calling isKindOfClass:. That means that the object must have the instance method of that name, and an exception will be thrown (if CoreFoundation is linked) or the process will abort if that is not the case. In the vast majority of cases, you don’t need to worry about this, since both root objects NSObject and NSProxy implement this method.

§Examples

Cast an NSString back and forth from NSObject.

use objc2::rc::Retained;
use objc2_foundation::{NSObject, NSString};

let obj: Retained<NSObject> = NSString::new().into_super();
let string = obj.downcast_ref::<NSString>().unwrap();
// Or with `downcast`, if we do not need the object afterwards
let string = obj.downcast::<NSString>().unwrap();

Try (and fail) to cast an NSObject to an NSString.

use objc2_foundation::{NSObject, NSString};

let obj = NSObject::new();
assert!(obj.downcast_ref::<NSString>().is_none());

Try to cast to an array of strings.

use objc2_foundation::{NSArray, NSObject, NSString};

let arr = NSArray::from_retained_slice(&[NSObject::new()]);
// This is invalid and doesn't type check.
let arr = arr.downcast_ref::<NSArray<NSString>>();

This fails to compile, since it would require enumerating over the array to ensure that each element is of the desired type, which is a performance pitfall.

Downcast when processing each element instead.

use objc2_foundation::{NSArray, NSObject, NSString};

let arr = NSArray::from_retained_slice(&[NSObject::new()]);

for elem in arr {
    if let Some(data) = elem.downcast_ref::<NSString>() {
        // handle `data`
    }
}